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vc4: Optimize the other case of SEL_X_Y wih a 0 -> SEL_X_0(a).

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Cleans up some output to be more obvious in a piglit test I'm looking at.
This commit is contained in:
Eric Anholt 2014-10-09 09:40:51 +02:00
parent ac557b4c12
commit 7c474f9f2e
1 changed files with 23 additions and 1 deletions
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24
src/gallium/drivers/vc4/vc4_opt_algebraic.c
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@ -174,7 +174,10 @@ qir_opt_algebraic(struct vc4_compile *c)
*/
replace_with_mov(c, inst, inst->src[1]);
progress = true;
} else if (is_zero(c, defs, inst->src[1])) {
break;
}
if (is_zero(c, defs, inst->src[1])) {
/* Replace references to a 0 uniform value
* with the SEL_X_0 equivalent.
*/
@ -183,7 +186,26 @@ qir_opt_algebraic(struct vc4_compile *c)
inst->src[1] = c->undef;
progress = true;
dump_to(c, inst);
break;
}
if (is_zero(c, defs, inst->src[0])) {
/* Replace references to a 0 uniform value
* with the SEL_X_0 equivalent, flipping the
* condition being evaluated since the operand
* order is flipped.
*/
dump_from(c, inst);
inst->op -= QOP_SEL_X_Y_ZS;
inst->op ^= 1;
inst->op += QOP_SEL_X_0_ZS;
inst->src[0] = inst->src[1];
inst->src[1] = c->undef;
progress = true;
dump_to(c, inst);
break;
}
break;
case QOP_FSUB: